Fountain pen refill ink cartridge



FIG. 1 is a side elevational view of a fountain pen refill ink cartridgeshowing our new design;

FIG. 2 is a left end elevational view; and

FIG. 3 is a right end elevational view.

The top, bottom and rear side views are identical to the showing in FIG.1.

The ornamental design for a fountain pen refill ink cartridge,substantially as shown and described.